I think my favorite place to eat is at Cinderella's Royal Table. I ate there for the first time with my husband (then just my boyfriend) 6 years ago and we got the same table on our honeymoon, so it's a special place to us.
(By the way, I totally agree with the above answer of Greece - I'd love to see that in EPCOT!)
What one ride would you miss most if Disney World decided to close it forever?